Process for weighting natural silk



Patented July -25 RENE oLAvnL, or BAsnL, swirznnnnma Pnoonss r03 wnren'rme NATURAL SILK I No Drawing 1 Application filed November 11, 1929, Serial No. 406,527, and in Germany March. 16,1929.

This invention relates to a further modification of the process described and claimed in my prior Patent No. 1,816,959,".

datedAugust 1, 1931 for weighing products consisting of natural silk or containing nat-' ural silk, inwhich, as in the main speciication, washing, deacidihcation and neutralization of the material treated With:

metallic salt-solutions, for example stannic chloride, before its introduction into the fixing solution, for examplealkali phosphate solution, are omitted and consists in thor-" oughly centrifuging 0r squeezing the ma terial after its treatment :with. metallic .salt' solution or freezing it in a similar man-- ner from excess of'metallic salt solution and then introducing it directly into; an acid fixing bath, phate solution, to which, if desired, acids. or acid salts may also be added. 'Protective colloids may also be added toth acid.

fixing bath. In place of monoesodium phosphate solution di-sodium phosphate solution may also be employed, the alkaline reaction of which has been converted into an acid reaction by the addition of acid substances, for example hydrochloric acid. Itisalso possible to effect satisfactory spotless weight-g ings without washing the products which have been treated with metallic salt in order to effect hydrolysis. a a

The invention is illustrated by the fol lowing examples '1.- Skeins of natural silk are dipped for a short timeinto a bath of stannic chloride.

' of Be, then'lifted out and left for a short time in the air. This operation may then, without washing with water, brought for a shorttime'into contact with a 15% if desired, rinsed fora shorttime inwater,

the final treatment of the silk may beeffected in a soap-containing water glass bath of at least 1 Be. at about 40 C.

25A mixed material, consisting of .nat-

ural Land artificial silk,' is dipped into a for example, monorsodium phos- 'terial.- r r 2.'A process for ,welg'htingnaturalsilk,

' from excess thereof and'then introducing it without Washing, deacidification or neutralsodium phosphate.

material isthen thoroughly centrifuged and squeezed out and introduced, without previously' washing with water, into a 15% mono-sodium phosphate bath, which con-'' .tains 100 cc. of hydrochloric acid of Sp.

Gr. 1.16 per litre. The acid is then neu trali'zed with a 2% cold sodium carbonate] solution and thematerial passed through a I 10% di-sodium phosphate solution at C.

"and then washed. The above treatments are repeated until the material has acquired the desired degreeof tin phosphate weighting. ..What I claim is V 1, A processforweighting textiles containing natural silk, comprising the steps of treating the material with a metallic salt 0 solution, freeing it from excess thereof and then introducing it 1 without washing, de-

: acidification or-neutralization directly into a bath containing an acid phosphate "of a. fixed alkali, and finally neutralizing the macomprising the step of treating the material with-a metallicsalt solution, freeing it ization directly into a bath containing an acid phosphate of a fixed alkali, and finally neutralizing the material.

3 A process according toclaim 1, wherein :the acid-fixing bath comprises a protec- V tive colloid.

be repeated several times. The skeins are then well centrifuged and squeezed .outand 4. A process according to claim 1, Wherein the acid'fixing'bathjcomprises a protec- V tive colloid and at least oneacid.

" 5. Aprocess according to claim 1, Wherein the acid fixing bath comprises, a protective colloid andat least one acid salt.

6.. A process according to claim 1, Wherein the acid fixing bath is a solution of monosodium phosphate. l

7. A process according toclaim 2 Wherein the acid fixing-bath is a solution of mono- RENE CLAVEL. 

